What begins as a collection of unsettling mysteries gradually reveals itself as a single, intricately designed whole

Why The Depths by Yrsa Sigurdardóttir is a Must-Read

The waters of the North Atlantic around Iceland are dark, cold, and deep: the perfect setting for Yrsa Sigurdardóttir’s latest thriller The Depths, the third book in her Black Ice series.

A career on a small fishing trawler is not for everyone, but for Gundrís, a last-minute contract as the replacement cook offers money she badly needs and danger she cannot ignore. A few days on rough seas will earn her more than three months’ salary at her usual job in a school canteen, but it will also force her to confront her past.

Her fears are well founded – her father lost his life at sea on a similar trawler, along with every other person on board, when the trawler sank after a devastating fire for which her father was blamed.

It is a family connection she does not want to share with her current crewmates. But when she finds her deceased father’s recipe book in her cabin, the same book she gave him as a child 18 years earlier, complete with her own inscription, it appears that someone on board knows more than they are letting on. How did the book end up on this trawler when it was supposedly on the vessel that went down with all hands? When one of her kitchen knives is stolen and someone enters her cabin in the middle of the night, things take a more dangerous turn. The real terror comes not from what is hidden beneath the water, but from what refuses to stay buried.

On land, things are not much safer. An unneighbourly dispute escalates into near war, with both sides convinced they are the innocent party. It seems at first like a simple case to occupy detectives Týr and Karó, but as they dig below the surface, events spiral into horror. Who dug up a family dog and dumped it in the family’s utility room? What is the truth behind a house fire in the cul-de-sac? And what is causing the awful smell from the garage?

What makes The Depths so effective is not simply the accumulation of shocks, but the way Sigurdardóttir makes every setting feel morally pressurised: the trawler, the cul-de-sac and Týr’s unresolved past all become confined spaces where old damage refuses to stay buried. The North Atlantic is more than a setting here; it becomes an accomplice to the novel’s dread.

As readers of the previous two books in Sigurdardóttir’s Black Ice series will know, the author never reveals her cards early. The currents at play here are as unpredictable as those tossing the trawlers in the North Atlantic. Seemingly random plot lines lap at the edges before colliding with devastating impact. These subplots are not distractions; each one adds pressure to the wider design, so that when the storm finally breaks, the release feels both chilling and earned.

The Depths is the perfect example of how plot, people, place, and purpose combine to draw us into a world that grips with its attention to detail and takes us on a journey where the destination is unclear at first but gathers inevitable momentum.

The story is undoubtedly dark: poisoned pets, death at sea, murders uncovered and secrets kept. Yet beneath the horror is a strong sense of humanity. Sigurdardóttir draws out family grief, community suspicion, buried guilt, and denial with a skill that keeps the novel from becoming a simple catalogue of shocks. Darkness alone does not sustain a thriller. The Depths succeeds because its horrors carry emotional weight.

Sigurdardóttir crafts a dark thriller so compelling that the reader is driven to turn the next page, even while knowing that further horror and chills await. Her control lies in building tension into every page, while plotting so carefully that each new shock feels natural rather than contrived.

The Depths is also interesting as the third book in a series. Each of the three novels stands alone, so readers could pick up this instalment, or indeed any book in the series, without previous knowledge. Sigurdardóttir treats each book as a fresh thriller, albeit one in which returning readers will already know the detectives.

Of course, that is not a new device. Nordic noir is full of familiar detectives solving the latest crime while battling their own demons. What Sigurdardóttir manages here is more restrained. Týr may be a detective we have already met, but his own plotline, uncovering the truth behind his mother’s murder and his own near brush with death, remains secondary. In other authors’ hands, that history might dominate half the book. Sigurdardóttir instead threads it through the margins, which makes the final-page twist feel less like a ripple than a tidal wave.

Victoria Cribb’s translation sustains the tension while keeping the narrative moving with clean, unobtrusive momentum. Few readers will know the blackness of the North Atlantic first-hand, but Sigurdardóttir and Cribb render it with such force that the bleakness of a trawler tossed across some of the world’s most inhospitable waters feels immediate and vividly imagined. What begins as a collection of unsettling mysteries gradually reveals itself as a single, intricately designed whole.

Long-running crime series sometimes lose steam by the third novel, but The Depths shows no sign of slackening. Dark, chilling and tightly controlled, it confirms Sigurdardóttir’s ability to turn dread, landscape, and human frailty into something that is both unsettling and compulsively readable.

The Depths by Yrsa Sigurdardóttir, translated by Victoria Cribb, is published by Hodder & Stoughton and out now.